(19)

(11)

EP 1 831 902 A1

(12)

(43) Date of publication: 12.09.2007 Bulletin 2007/37 (21) Application number: 04804399.6 (22) Date of filing: 27.12.2004

(51) International Patent Classification (IPC):  H01F 27/32(2006.01) (86) International application number: PCT/EP2004/014813 (87) International publication number: WO 2006/069590 (06.07.2006 Gazette 2006/27)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR (71) Applicant: ABB Technology AG 8050 Zurich (CH)	(72) Inventor: HRKAC, Miljenko I-35042 Monselice (IT) (74) Representative: De Santis, Giovanni  ABB Service S.r.l. Viale L. Lama 33 20099 Sesto San Giovanni (MI) 20099 Sesto San Giovanni (MI) (IT)